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Hi I am on the looking for suggestions for a set of 26" forks, with canti bosses for and old GT gravel build. they will be replacing a knackered set of suspension forks so will need to be suspension corrected
See also Surly or On One.
Project 2s come up on the eBay pretty regularly and go for about £60.
That's what I used for my bontrager frankenshopper

Budget?
http://carverbikes.com/parts/forks/xc-410-retro/
If you want that pace RC30 look.... They do a longer A2C fork, but I don't think it comes with the optional canto mounts.
https://www.bike-discount.de/en/bike/bike-parts/mountain-bike-parts/mtb-forks/26-rigid-forks/
Good selection here.